# Reluctance Motor MCQ (Multiple Choice Questions) :: Single Phase Induction Motor

11. Calculate the heat absorbed by a 3 Ω resistor when 6 V is applied across it.

A. 12 W
B. 10 W
C. 8 W
D. 11 W

The resistor always absorbs active power and dissipates it in the form of heat.

Power absorbed by a 3 Ω resistor is 6×6÷3=12 W.

12. What is the unit of power?

A. Joule/sec
B. Joule/sec2
C. Joule/sec3
D. Joule/sec4

Power is defined as the rate at which work is done. The ratio of energy and time is power. It is expressed in Watt or Joule/sec.

13. Convert 20 ℃ into Fahrenheit.

A. 68 ℉
B. 58 ℉
C. 78 ℉
D. 48 ℉

Temperature can be expressed in Celsius and Fahrenheit. The Standard unit of the temperature is the Kelvin(K).

(20℃ × 9/5) + 32 = 68℉.

14. Convert 50℉ into Celsius.

A. 20 ℃
B. 10 ℃
C. 30 ℃
D. 40 ℃

Temperature can be expressed in Celsius and Fahrenheit. The basic unit of temperature in SI is the Kelvin. The formula used is

(50℉ − 32) × 5/9 = 10℃.

A. Intermittent duty
B. Short-time duty
C. Continuous duty with constant load
D. Continuous duty with variable load

16. Which motor is preferred for Jaw crushers?

A. WRIM
B. SCIM
C. Belt slip ring IM
D. DC shunt motor

Belt slip ring IM is preferred for the operation of Jaw crushers. A high starting is provided by the Belt ring IM. Slip rings are used to add external resistance.

17. A high starting torque is offered by the Belt Conveyors.

A. True
B. False

The Belt Conveyors can provide continuous-flow transportation. The amount of material transported on a conveyor system depends upon belt speed, and belt width.

18. Which starting method is the worst method in Induction motor?

A. Direct online starting
B. Autotransformer starting
C. Reactance starting
D. Star-Delta starting

The Reactance starting method is the worst method in an Induction motor. It uses the concept of the potential divider. The losses are very high in the case of the Reactance starting method.

19. Induction motor is also known as __________

A. Frequency changer
B. Frequency remover
C. Time period remover
D. DC machine

The Induction motor is also known as a frequency changer. The stator frequency can be changed using the slip concept. The rotor frequency of IM is slip×(stator frequency).

20. The capacity of the Crane is expressed in terms of tonnes.

A. True
B. False